Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 24, 2016	Jun. 30, 2017	Jun. 24, 2016	Dec. 31, 2016
Accounting Estimates [Abstract]
Increase in operating income due to changes in contract estimates	$ 41	$ 44	$ 81	$ 100
Percentage of increase in consolidated operating income due to changes in contract estimates	13.00%	18.00%	14.00%	20.00%
Increase in operating income due to changes in contract estimates, diluted (in dollars per share)	$ 0.34	$ 0.36	$ 0.65	$ 0.83
Revenue Recognition [Abstract]
Percentage of net sales accounted for under contract accounting standards					50.00%
Percentage of fixed-price type contracts					41.00%
Percentage of cost-plus type contracts					9.00%
Period of performance for contracts accounted for under the percentage-of-completion method of accounting, minimum			1 year